Improvement in draught-regulators



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- Letters Patent N 96,494, dated November 2, 1869;

-n-OF- IMPROVEMENT IN DRAUG-HT-REGUIATORS.

The vSciltaerulc referred to in these Letters Patent and making part of the sanie.

To ll-whom it may concern Bc it known thatwe, JAMES J. SMITH andSAM- UEL WOOD, ot' Cleveland, in the county ot' Cuyahoga, and Statoof Ohio, have invented a new and uset'ul Improvement in Draught-Regulators; and we do hereby declare thatI the following isa full, clear, and exaetdescription thereot', which will enable others skilled iu the art to make and use the same, rel'erence heilig had to the accompanying drawings, forming part ot' this specification.

This invention relates to a new and useful improve,- ment `in regulating the draught ot' steam-boiler chimneys, and the pressure ot' thc steam; and consists in the arrangement ot' au open tube, with a cohuun ot' mercury, which is subject to steam and atmospheric pressure, iu combination withsuitable meehauisu'i t'or operating upon draught-dampers, and also tbracting upon the safety-valve, the whole arranged as hereinafter more l'ully described.

In the accompanying plate of drawings- Figure 1 is a vertical section of a stema-boiler and arch, with the regulatilig-apparatus attached according to my invention, the section being through the line :c :v of tig. 2.

Figure 2 is a side elevation ofthe saine..

Similar letters of' reference indicate corresponding parts.

A represents a steam-boiler.

B represents the arch or mason-work, in which the boiler is placed.

Gfis a dra light-aperture iu the side of the fire-box, and

D is a draught-apertm-e in the side of the ash-pit.

E is the tire-box or furnace.

F is the ash-pit.

G represents the fire-grate.

lhe draught-apertures C and D are enclosed by boxes or chests H and 1, and each is pro-vided with a and operates upon an elastic diaphragm, which is couiiued between the two conical anges P l.

It is a rod, which is confined to the elastic dialphragm, and plays ii'cely up and down through the upper tiange 1, its motionbeing governed by the action ot thc mercury on the diaphragm, while the .ac-

`tion ot' Vthe mercury is gever-cned by the pressure of the steam from the boiler. Y

lhe chamber L is placed at such a distance below the diaphragm, that the weight of a'. column of mercury ot' the height between the two, will be equal to the pressure required to be maintained in the boiler.

The rise and fall ot the rod It is made to opera-te the dampcrs J K, by means ot the lever S and the chains 'l U, the chain 'l being attached to the upper damper J, as seen at V, and the chain `U being `attached to the damper K, as seen at- \V, and the chains are so connected, that when the elastic diaphragm is down, the lower damper is open.

The t'ulcrum ofthe lever S is at X.

Y is a forked stand, to guide the lever.

The lever S is weighted, as Seen at Z, so as to couuterbalance the weight ofthe dampeiiK.

It will be readilysecu that when the lower damper is open, and the upper one closed, they are arranged in the best possible manner to increase the combustion 0f the fuel in the. tin-nace'and get up steam.

W hen the pressure of steam has increased to such an extent as to raise the diaphragm by its pressure ou the mercury, the lower damper will be closed, as well as the, upper one, as there will be `suiiicient slack iu the chain T, (which is attached tothe upper damper,) to prevent the lever S from acting upon that damper atonce.

Should the closing of the lower damper, under these circumstances, not he suliicient to s laeken the lire,

the pressure will raise. the level" S to its full height-,'

which will litt the upper damper, and allow a current otcold air to pass through the lire-box and up the stack.

1t is presumed that these two dampers willI be sut'- icient to control and regulate the generation of steam, but. as au extra precaution againstaccident. from overprcssure of' steam, and also to insure the better workiag ot' thesatety-valve, we provide another elastic diaphragm, at A', (similar in its operation to the one already describeth) and place it at a. considerable elevation above the other, so that it will not be affected by the pressure, except when the. lever S is raised to its fullest extent, and when the other means provided have not been sutiicieut to reduce the pressure.

The pipe N is attached at near the bottom of the chamber L, and sustains au open column vot' mercury when the pressure ot steani forces the mercury from the chamber, and when, by a reduction ot' the pressure, the mercury sinks back into the chamber, the airenters and occupies the tube.

By this arrangement, the control of the. draught. and the generation of steam and pressure in thcbeiler are believed. to be complete.

Where the steam is allowed to act directly upon the diaphragm, (or in contact thcrewith,) the daphmgm is soon'destroyed by the hea-t thus imparted.

The use of the mercury prevents all injury from this cause.4

Having thus described our invention,

We claim as new, and desile to secure by Letters APatent l 1. The use ofmerf'ury in an open column, substam tially :Ls and for the purposes described.

2. The construction and arrangement of the merfury-chamber L, ai; the. base of an open column, substantially :ls described, :md for the purposes specified. 3. The urmngcnwnt of the'inerrnriul tube and the devices (3o-operative therewith, in the nnlnner described, nnd for the purposes svt fui-th.

JAMES J. SMITH.

SA'MUEL WOOD.

W'ituesses:

GEO. HESTER, L. B. EAGER. 

